Revert of Allocator shims working on VS2015.

base/allocator/allocator_check.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/allocator/allocator_check.h"
 
 #include "build/build_config.h"
 
-#if defined(OS_WIN)
-#include "base/allocator/allocator_shim_win.h"
-#endif
-
 #if defined(OS_LINUX)
 #include <malloc.h>
 #endif
 
 namespace base {
 namespace allocator {
 
+// Defined in allocator_shim_win.cc .
+// TODO(primiano): replace with an include once base can depend on allocator.
+#if defined(OS_WIN) && defined(ALLOCATOR_SHIM)
+extern bool g_is_win_shim_layer_initialized;
+#endif
+
 bool IsAllocatorInitialized() {
 #if defined(OS_WIN) && defined(ALLOCATOR_SHIM)
-  // Set by allocator_shim_win.cc when the shimmed _set_new_mode() is called.
+  // Set by allocator_shim_win.cc when the shimmed _heap_init() is called.
   return g_is_win_shim_layer_initialized;
 #elif defined(OS_LINUX) && defined(USE_TCMALLOC)
 // From third_party/tcmalloc/chromium/src/gperftools/tcmalloc.h.
 // TODO(primiano): replace with an include once base can depend on allocator.
 #define TC_MALLOPT_IS_OVERRIDDEN_BY_TCMALLOC 0xbeef42
   return (mallopt(TC_MALLOPT_IS_OVERRIDDEN_BY_TCMALLOC, 0) ==
           TC_MALLOPT_IS_OVERRIDDEN_BY_TCMALLOC);
 #else
   return true;
 #endif
 }
 
 }  // namespace allocator
 }  // namespace base